<template>
  <div class="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo" />
        <MyList :todos="todos" :checkedTodo="checkedTodo" :deleteTodo="deleteTodo" />
        <MyFooter :todos="todos" :allChecked="allChecked" :deleteAllDone="deleteAllDone" />
      </div>
    </div>
  </div>
</template>

<script>
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import MyFooter from './components/MyFooter'
import localStorageCache from './localStorageCache'

export default {
  name: 'App',
  data() {
      return {
          todos: []
      }
  },
  components: {
    MyHeader,
    MyList,
    MyFooter
  },
  mounted() {
    this.todos = localStorageCache.get('todos') || []
  },
  watch:{
    todos: {
      deep: true,
      handler(newValue, oldValue) {
        localStorageCache.set('todos', newValue)
      }
    }
  },
  methods:{
    // 添加一个事项
    addTodo(todo) {
      this.todos.unshift(todo)
    },
    // 勾选或取消勾选一个事项
    checkedTodo(id) {
      this.todos.forEach(todo => {
        if (todo.id === id) {
          todo.done = !todo.done
        }
      })
    },
    // 全选或全不选
    allChecked(done) {
      this.todos.forEach(todo => todo.done = done)
    },
    // 删除一个事项
    deleteTodo(id) {
      this.todos = this.todos.filter(todo => todo.id !== id)
    },
    // 删除所有已完成的
    deleteAllDone() {
      this.todos = this.todos.filter(todo => !todo.done)
    }
  }
}
</script>

<style>
body {
  background-color: #fff;
}

.btn {
  display: inline-block;
  padding:4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.2),0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}

.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

</style>
